Operational Art of War 2: Modern Warfare

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Attack helicopters should be used in 4 cases: to screen or anchor exposed flanks, as airborne reconnaissance units, as escorts for transport helicopters, and to engage enemy armor from long range.

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Remember that from the 1970s and on, most western armies have been equipped with advanced night-fighting capabilities. As a result, western armies, in particular the United States and its NATO allies, are much better at conducting round-the-clock operations than eastern armies.